Forming attachment for lathes



Feb. 1, 1927.

J; J. THACHER FORMING ATTACHMENT FOHLATHES Filed May 31, 1923 III LE1 IN VEN TOR J]. Thacher ATTORNEY JOHN J. TEACHER, OF WETHERSFIELD, CONNECTICUT, ASSIG-N'OE T PRATT & WHIT- NEY COMTEANY, OF NEW YORK, N. "EC, A COR-FORATION 01 TNEVJ' JERSEY.

FORMING- ATTACI-H/IENT FOR LATHES.

Application filed May 31,

This invention relates to machine tools and particularly to an improved taper attachment adapted to be used in connection with turning lathes and like machines.

The primary object of the invention is to provide an attachment adapted to guide the tool to perform both taper and straight turning and so adjustable that the relative depth of cut on the taper and straight portions of the work piece may be regulated as desired. in accordance with the invention. a sectional guide bar is provided for controlling the cutting position of the tool slide. The two sections of the bar, as illustrated in the accompanying drawing, are positioned end to end, one section being in the form of a taper bar and laterally adjustable about a pivot adjacent one end and the other section being bodily adjustable laterally toward and from the tool slide. By such cooperating adjustments. the work piece may be cut to the desired taper and the adjacent straight portion thereof may be cut to the relative depthdesired, such operations being entirely automatic after the bar has once been properly adjusted.

Another object of my invention is to provide a taper attachment of the type stated comprising a sectional guide bar having the adjacent sections thereof disposed in end to end relation, one of the said sections being in the form of a taper bar and angularly adjustable about a pivot and the adj acent section being bodily adjustable laterally by means of a novel tongue and groove connection, the tool slide of course being operatively connected to the bar in a manner to be guided thereby as the tool carriage and slide are fed along the lathe bed in the tooling operation.

With the above and other objects in View, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawing. In such drawing annexed hereto and forming a partof this specification, T have shown one form of my invention embodied in a turning lathe but it will be understood that the invention can be otherwise embodied and that the drawing is not to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

1923. Serial No. 642,601.

Referring to the figures of the drawing:

Figure 1 is a transverse sectional view through a lathe bed showing my improved taper attachment applied thereto.

Fig. 2 is an enlarged plan view of my taper attachment.

Fig. 3 is a view illustrating a piece of work turned by the attachment as adjusted to the position illustrated in Fig. 2.

Fig. 4 is a front elevation of the attachment partially in section Fig. 5 is a vertical sectional view taken on line 5-5 of Fig. 2.

Fig. 6 is a vertical sectional view taken on line 6-6 of 2.

Referring more specifically to the drawing by reference characters, 1 indicates the bed of a lathe supporting a tool carriage 2 on the longitudinally extending 8 thereon. A tool slide 1 mounting a tool 5 is transversely movable on a taper slide 6 on the carriage. A screw 7 is provided for adjusting the tool slide transversely on the taper slide. My improved taper attachment is supported on a bracket 8 adjustably mounted on a guideway 9 on the bed 1, a hook bolt 10 being provided for securing the bracket in place.

My improved attachment. as illustrated in the drawing, comprises a gu de bar having two sections 11 and 12 mounted. on the supporting surface 13 of the bracket 8. These sections are disposed in end to end relation and have raised guiding portions 11 and 12 adapted to be engaged by guide rollers 1 and 15 on the taper slide. The roller 14 may be resiliently held in contact with the bar in the usual manner. The section 11 is in the form of a taper bar adjustable about a pivot clamping screw 16 adjacent the section 12. A clamping screw 17 extends upwardly through a slot 18 in the bracket and threadedly engages the end of the section 1.1. The section 11 therefore is adapted to function as a taper bar and the justed bodily as will presently be described.

Secured to the support 13'by means otpins v and screws 21- is a rectangular block 22. The under side of the section 12 is provided with a rectangular recess 23 therein accurately formed to slidably engage over the block. The ends of the block 22 are provided with laterally extending screw threaded ears 24 having screws 25 threaded thereinto. The ends of these screws are adapted to engage against shoulders formed by notcliin'g the portion 12 of the section 12; A clamping screw 27 extends upwardl'y through elongated openings formed in the surface 13 and block 22' and threads into the section 12. I

As illustrated in Fig. 2, the section 12 oi the guide bari's positioned parallel with the axis of the work piece W which is also parallel with the ways 3 of the lathe he'd. By

adjusting the screws the section 12 may be moved along the block 22 to adjust the section bodi'ly toward and from the work. It will be noted, however, that in all such adjustments, the section remains parallel with the ways The section may be secured in its adjusted position by i n't'ian's of the clamping screw 27 In Fig.3 of the drawing is illustrated a piece of work l V turned by the attachment adjusted to the position shown in Fig. 2. The desired taper a may be given to the work piece by setting" the section 11 to the proper angle. Also the cylii'idrical portion 6 of the work piece maybe turned to the relative diameter desired by setting the section 12 to the proper position. It should iurtherinore be noted that the block 22 is parallel to the bevelled surface 28 of the section 12 whereby the said block directly receives the thrust of the tool Wllll the same is being forced deeper into the work to form the shoulder c at the beginning oi? the cylindrical surface Z) thereon; The work piece illustrates only one form of w'orli which may be Pflfl OI'Il'l'Gd by my improved attachment, the same being capable of turning many and various relatively shaped pieces by properly adjusting the two' sections of the guide bar For example, it will be readily aparent that the work piece illustrated in Fig. 3 may be tapered in the opposite direction from that illustrated at a or the same may be made cylindrical, like the surface I), merely by adjusting the taper bar section 11.

What I claim j 1. In combination, a support,- a tool guide but comprising two sections supported thereon in end to end relation, one section of the guide bar having a tongue and groove connection to the support, the said tongue and groove extencling at an oblique angle to the operating face of thesection, the other section being pivoted at a point adjacent the first section, means whereby the first section can be adjusted along the said tongue and groove connection to bodily adjust the said section obliquely relatively to said support, and means whereby the second section can be angularly adjusted about the pivot.

2. In a machine tool, the combination oi a bed, a tool carriage movable longitudinally thereon, a tool slide movable laterally on the carriage, a sectional guide bar extending along the ben, n1eans operatively connecting the slide to the bar whereby the bar controls the lateral position of the slide as the carriage moves along the bed, one sec'-' tion of the guide bar being in the form oi a taper bar and adjustable angularly about a pivot, the other section forming a cooperating extension ot" the taper bar and being obliquely adjustable relative thereto in a fixed direction, and means for securing the sections n their adjusted positions.

3. In a machine tool, the c'ombinati 1 ot a bed, a tool carriage movable longitudinally thereon, a tool slide movable laterally on the carriage, a sectional guide bar extendii along the bed, means opera'ti'vely connecting the slide to the bar whereby the bar controls the lateral position of the slide as the carriage moves along the bed, one section of the guide bar being bodily adjustable obliquely in a fixed direction relative to the slide, the other section being in the form of a taper bar and adjustable angularly about a pivot adjacent the first section, and means for securing the sections in their adjusted positions.

4-. In a machine tool, the combination: of a bed having longitudinally extending ways thereon, a tool carriage movable on the ways, a tool slide movable laterally on the carriage, a tool guide bar comprising two sections extending along the bed in end to end relation, means operatively connecting the slide to the bar whereby the bar controls the lateral position of the slide as the carriage mot es along the bed, one section of the guide bar being maintained parallel with the said ways and being adjustable obliquely toward and from the slide, and means for securing the adjustable section in position.

In a machine tool, the combination of. a bed having longitudinally extending ways thereon, a tool carriage movable on the ways, a tool slide movable laterally on the carriage, a sectional guide bar extending along the bed. means operatively connecting the slide to the bar whereby the bar controls the lateral position of the slide as the carriage moves along the bed, one section of the guide bar being maintained parallel with the said ways and being adjustable obliquely toward and from the slide in a fixed direction, the other section being in the form of a taper bar and adjustable laterally about a pivot adjacent the first section, and means for securing the sections in their adjusted positions.

6. In a machine tool, the combination of a bed, a tool carriage movable longitudinally thereon, a tool slide movable laterally on the carriage, a sectional guide bar supported on the bed With the sections thereof in end to end relation, means operatively connecting the slide to the bar whereby the bar controls the lateral position of the slide as the carriage moves along the bed, one section of the guide bar being angularly adjustable about a fixed pivot adjacent the first section, and means for adjusting the other section in a straight line relative to the slide.

7. In a machine tool, the combination of a bed having longitudinally extending ways thereon, a tool carriage movable. on the ways, a tool slide movable laterally on the carriage. a sectional guide bar supported on the bed with the sections thereon in end to end relation, one of such sections being slightly ofiset laterally relative to the other section and parallel with the said ways, means for bodily adjusting the said oflset section obliquely toward and from the slide in a fixed direction, and means for adjusting the other section about a pivot adjacent the first section.

8. In amachine tool, the combination of a bed having longitudinally extending Ways thereon, a tool carriage movable on the ways, a tool slide movable laterally on the carriage, a bracket support on the bed laterally of the ways, a tool guide bar comprising two sections supported on the bracket in end to end relation, means operatively connecting the slide to the bar whereby the bar controls the lateral position of the slide as the carriage moves along the bed, one section of the guide bar being maintained parallel with the said ways and having a tongue and groove connection to the bracket support, the said tongue and groove extending obliquely to the said ways, and means Whereby the first section can be moved along the said tongue and groove connection to bodily adjust the said section obliquely toward and from the said ways in a fixed direction.

In testimony whereof, I hereto afiix my signature.

JOHN J. TEACHER. 

